<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>margin合并</title>
    <style>
        .box {
            width: 200px;
            height: 200px;
        }
        .box1 {
            background-color: deepskyblue;
            margin-bottom: 50px;
        }
        .box2 {
            background-color: orange;
            margin-top: 50px; /*写了和没写一样*/
        }
    </style>
</head>
<body>
    <div class="box box1">1</div>
    <div class="box box2">2</div>
</body>
</html>